/*

-----------------------------------------------------------------------------

This source file is part of OGRE

    (Object-oriented Graphics Rendering Engine)

For the latest info, see http://www.ogre3d.org/

Copyright (c) 2000-2014 Torus Knot Software Ltd

Permission is hereby granted, free of charge, to any person obtaining a copy

of this software and associated documentation files (the "Software"), to deal

in the Software without restriction, including without limitation the rights

to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

copies of the Software, and to permit persons to whom the Software is

furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in

all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

THE SOFTWARE.

-----------------------------------------------------------------------------

*/

#include "OgreStableHeaders.h"

#include "OgreResourceBackgroundQueue.h"

namespace Ogre {

    // Note, no locks are required here anymore because all of the parallelisation

    // is now contained in WorkQueue - this class is entirely single-threaded

    //------------------------------------------------------------------------

    //-----------------------------------------------------------------------

    template<> ResourceBackgroundQueue* Singleton<ResourceBackgroundQueue>::msSingleton = 0;

    ResourceBackgroundQueue* ResourceBackgroundQueue::getSingletonPtr(void)

    {

        return msSingleton;

    }

    ResourceBackgroundQueue& ResourceBackgroundQueue::getSingleton(void)

    {  

        assert( msSingleton );  return ( *msSingleton );  

    }

    //------------------------------------------------------------------------

    ResourceBackgroundQueue::ResourceBackgroundQueue() {}

    ResourceBackgroundQueue::~ResourceBackgroundQueue() {}

    //------------------------------------------------------------------------

    std::future<void> ResourceBackgroundQueue::initialiseResourceGroup(const String& name)

    {

        auto task = std::make_shared<std::packaged_task<void()>>(

            [name]() { ResourceGroupManager::getSingleton().initialiseResourceGroup(name); });

        Root::getSingleton().getWorkQueue()->addTask([task]() { (*task)(); });

        return task->get_future();

    }

    //------------------------------------------------------------------------

    std::future<void> ResourceBackgroundQueue::initialiseAllResourceGroups()

    {

        auto task = std::make_shared<std::packaged_task<void()>>(

            []() { ResourceGroupManager::getSingleton().initialiseAllResourceGroups(); });

        Root::getSingleton().getWorkQueue()->addTask([task]() { (*task)(); });

        return task->get_future();

    }

    //------------------------------------------------------------------------

    std::future<void> ResourceBackgroundQueue::prepareResourceGroup(const String& name)

    {

        auto task = std::make_shared<std::packaged_task<void()>>(

            [name]() { ResourceGroupManager::getSingleton().prepareResourceGroup(name); });

        Root::getSingleton().getWorkQueue()->addTask([task]() { (*task)(); });

        return task->get_future();

    }

    //------------------------------------------------------------------------

    std::future<void> ResourceBackgroundQueue::loadResourceGroup(const String& name)

    {

        auto task = std::make_shared<std::packaged_task<void()>>([name]()

        {

#   if OGRE_THREAD_SUPPORT == 1

            ResourceGroupManager::getSingleton().loadResourceGroup(name);

#   else

            ResourceGroupManager::getSingleton().prepareResourceGroup(name);

            Root::getSingleton().getWorkQueue()->addMainThreadTask(

                [name]() { ResourceGroupManager::getSingleton().loadResourceGroup(name); });

#   endif

        });

        Root::getSingleton().getWorkQueue()->addTask([task]() { (*task)(); });

        return task->get_future();

    }

    //------------------------------------------------------------------------

    std::future<void> ResourceBackgroundQueue::prepare(const ResourcePtr& res)

    {

        auto task = std::make_shared<std::packaged_task<void()>>(

            [res]()

            {

                res->prepare(true);

                Root::getSingleton().getWorkQueue()->addMainThreadTask([res]() { res->_firePreparingComplete(); });

            });

        Root::getSingleton().getWorkQueue()->addTask([task]() { (*task)(); });

        return task->get_future();

    }

    //------------------------------------------------------------------------

    std::future<void> ResourceBackgroundQueue::load(const ResourcePtr& res)

    {

        auto task = std::make_shared<std::packaged_task<void()>>(

            [res]()

            {

#if OGRE_THREAD_SUPPORT == 1

                res->load(true);

                Root::getSingleton().getWorkQueue()->addMainThreadTask([res]() { res->_fireLoadingComplete(); });

#else

                res->prepare(true);

                Root::getSingleton().getWorkQueue()->addMainThreadTask(

                    [res]()

                    {

                        res->load(true);

                        res->_fireLoadingComplete();

                    });

#endif

            });

        Root::getSingleton().getWorkQueue()->addTask([task]() { (*task)(); });

        return task->get_future();

    }

    //---------------------------------------------------------------------

    std::future<void> ResourceBackgroundQueue::unload(const ResourcePtr& res)

    {

        auto task = std::make_shared<std::packaged_task<void()>>([res]() { res->unload(); });

        Root::getSingleton().getWorkQueue()->addTask([task]() { (*task)(); });

        return task->get_future();

    }

    //---------------------------------------------------------------------

    std::future<void> ResourceBackgroundQueue::unloadResourceGroup(const String& name)

    {

        auto task = std::make_shared<std::packaged_task<void()>>(

            [name]() { ResourceGroupManager::getSingleton().unloadResourceGroup(name); });

        Root::getSingleton().getWorkQueue()->addTask([task]() { (*task)(); });

        return task->get_future();

    }

}